linux-kernel - [PATCH 27/37] debug_core,kdb: Allow the debug core to process a recursive debug entry

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Message-Id: <1261603190-5036-28-git-send-email-jason.wessel@windriver.com>
Date:	Wed, 23 Dec 2009 15:19:40 -0600
From:	Jason Wessel <jason.wessel@...driver.com>
To:	linux-kernel@...r.kernel.org
Cc:	kgdb-bugreport@...ts.sourceforge.net, kdb@....sgi.com,
	mingo@...e.hu, Jason Wessel <jason.wessel@...driver.com>
Subject: [PATCH 27/37] debug_core,kdb: Allow the debug core to process a recursive debug entry

This allows kdb to debug a crash with in the kms code with a
single level recursive re-entry.

Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
---
 kernel/debug/debug_core.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index e44e693..e6c6f8a 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -443,6 +443,10 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
 	}
 
 	printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
+#ifdef CONFIG_KGDB_KDB
+	/* Allow kdb to debug itself one level */
+	return 0;
+#endif
 	dump_stack();
 	panic("Recursive entry to debugger");
 
@@ -487,6 +491,9 @@ acquirelock:
 	smp_wmb();
 	atomic_set(&cpu_in_kgdb[cpu], 1);
 
+	if (exception_level == 1)
+		goto cpu_master_loop;
+
 	/*
 	 * CPU will loop if it is a slave or request to become a kgdb
 	 * master cpu and acquire the kgdb_active lock:
-- 
1.6.4.rc1

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